[zeromq-dev] Can't get ZMQ_REQ_RELAXED to run

Christian Kamm kamm at incasoftware.de
Tue Nov 19 06:11:08 CET 2013

A stack trace of the process when zmq_msg_send() blocks could already be telling. It sounds like it's getting stuck in either pipe::terminate() or dealer::xrecv()...


Pieter Hintjens <ph at imatix.com> wrote:

>Hi Björn,
>The best thing when it comes to specific functionalities like this is
>a minimal test case that shows the problem.
>On Mon, Nov 18, 2013 at 9:09 AM, Björn Kuhlbrodt
><bjoern.kuhlbrodt at gpsolar.com> wrote:
>> Hello
>> I' trying to use the new (4.0.1) ZMQ_REQ_RELAXED in C++ with VS2010 (and the standard C-Binding from the 0MQ main site), but keep failing.
>> What I have:
>> One context with two ZMQ_REQ sockets in two different threads, one binds and answers to REQs, one connects and sends REQs. This runs fine and nice until one system crashes before answering a REQ - a known Problem of the REQ-REP.
>> What I tried:
>> I'm not too eager to kill the context to get the REQ-REP running again, because that would kill my other socket too. The new ZMQ_REQ_RELAXED came in very handy, just fit to solve the problem.
>> BUT:
>> Now the zmq_msg_send(...)-Method fails to return after a few packages (or even for the first packet) while the client is up and waiting for packages, yes even actively communicating with the server over the other socket. I tried ZMQ_REQ_CORRELATE on and off - doesn't make a change. Tried ZMQ_REQ_RELAXED off again - everything works (except in crash-case).
>> So my question:
>> Anyone here tried the ZMQ_REQ_RELAXED? Any idea? I'm willing to post code, but I'd need to extract the crucial parts, which could take a while.
>> Regards
>> Bjorn
>> Dr. Björn Kuhlbrodt
>> Senior Software Developer
>> GP Inspect GmbH
>> Tel: +49 89 750778 4729
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>> Mail: bjoern.kuhlbrodt at gpsolar.com
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>Pieter Hintjens
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